You can add comments to documents.
A comment can contain various markup elements and a description.
When you add comments to part or assembly files, the comments are added to the current state of the model and remember that model state. “State of the model” includes visibility (hidden or shown components, cross sections, transparencies), orientation, zoom level, and pan position.
Comments are displayed on the Markup pane. When you reply to a comment, the reply is part of a discussion thread.
To add a comment: